Pneumatic screw driver



Aug. 26, 1930. w. E. MCLAUGHLIN PNEUMATIC scnsw DRIVER Filed May 13,1929 4 Sheets-Shee v INVENTOR A TTOANEY 26, 1930- w. E. M LAUGHLIN1,774,030

PNEUMATIC SCREW DRIVER Filed May 13. 1929 4. Sheets-Sheet 2 JICLZ.

[NVENTOR ATTORNEY Aug. 26, 1930. w. E. M LAUGHLIN PNEUMATIC SCREW DRIVERFiled May 13, 1929 4 Sheets-Sheet 5 F/G.8.' J/Qg INVENTOR A TTORNEY Itheset screw 53'to the sleeve 51. On this sleeve 52 is mounted a thrustbearing 52 by means of springs or brackets 54*. The fingers 54 are partof an attachment shown in Figure 4 adapted to be inserted or attached tothe rloweifipiart of the sleeve 51; by means of springs or bracketsb i.Atttiched'to these same brackets is a magazine 63 for containin-grandguiding ,jscrews into thelower parts nfthefingers 54;? Within thisthrust bearing- 52 is the screw driver bit 54 The gear 44 turns looselyontheshaft V The bit 54 is provided with a screw drive head 56 whichengagesthejscrew 55.

The gear 44 is driven by the gear 57 from the shaftf58 that,in turn,'isdrivenby the bevel "gears -59 and 60 from any suitable s ster-seerprewar cit the belt 62.-

. Tl'ie'screwieedingmechanism iscontrolled was position of the screwdriver. When the screw driver Iis withdrawn from the sleeve 52the'screwatthe'bottom of the colinfthestoragejline63 isa'llowed to dropto semen "between the spring hfeld'fingers 't'istIienini-positionto'bepressed downwardly. and out'w'ardly between the spring fingers tyahe'serw driver'56. I prefer to build these spring fingers with a pair ofstiff flioldingfineinbers asind'ica'ted mounted .o l l i g' fiw g..- s,

The dew mare movement of the screw driver isl' rfesi'ste'd the spring64'which restsag fn ttliefcollar-65, at one'endand on the Methodofoperatz'on arm n g upp y f eir e es through-thepipe'lfanda screwis"111 posi- Figure 4' by depressing the :treadle ZYthe e74 is moved toaposition shown iii full linesin' Figure l'which opens thel ifi'20,landhlqsesthe line 10. Pressure ft nt rs i f i rr f n i ie d 23forcing; the crewdriver p'iston 17 downijv'vjard1y., The piston 17restsupon a bronze steered? whiehgin turn, rests upon 'aball .hearinsZ fi 11 of h lristiin" fed Thjis moves the screw driver downwardly. v

The screw driver is already being rotated {through .thegears, 57 andletq vflhe down- .ward movement of the screw driver with :thefscre'wforces the screw intothework from betweenthe fin-gers 54 and against theresistanceofthe spring 549.011 these fingers.

When the-trea'dl'e 7,, islifted under the infiuence of the spring 8, thevalve 4 is shifted 'so that the'line 20 is closed and the line 10 isopened, thus placing air beneath the piston '17, screwdriver. When thishapp nsgthescmw in the magazine 63 next iii line" isallowed:to drop intoposition between the s '54.

.- It will ibe iinderstoodthiat'I a -1 it an prehend withinin'yinventions'iich modifina tica-lly by applying pressureitoeitherjside ofsaid piston, a clutch for connecting said screw; driver to said drivingmeans, said clutch being connected to said cylinder, asecond"stationarycylinder, a piston and piston rod therein connected tothe first cylinder wherebythe movement of the first cylinder will causesaid clutch to engage with the driving means to rotate the screw driver.

"2.1111 combination,a screw driver, a driv- "mg means mounted looselythereon, a piston "on said screw drlver, a cylinder, means forraisingand lowering the screw driver pneumatically by applyingpressuretoelther side otsaid piston, a clutch for connecting said screw"driver tosaid driving means, L said clutch being connected tosaldcylinder, a sec- "ond stationarycyhnd'er, a piston-and piston rodthereinconnectedto the first cylinder whereby the movement of the firstcylinder will cause-said clutch to engage with the driving means torotate the screw driver, and a thrust bearing between said clutch'andsaid first mentioned cylinder. 7 Y v i 3. In combination, a screwdriver, a driving m'eans mounted loosely thereon, a piston on said screwdriver, a cylinder, means for raising and lowering the screw driverpneumatically by applying pressure to either side of said piston, aclutch for connecting said "screw driver to said driving means, saidclutch beln'gc'onnectedto said cylinder, a second stationary cylinder, apiston and piston rod therein connected 'to the-first cylinder wherebythQJTlOVGIIlGHtOf the first cylinder winch-1S6 said clutch to engagewith the driving means to rotate the screw driver, and

yie'ldingine'ans between said clutch and said first mentionedcylinder..1

4. In combination, a stationary frame, a stationary cylinder mountedthereon, means for applying pressure to one end of said cylfinder, apiston andpiston rod therein, a sec- ,ond cylinder adapted to move withrespect to said frame and first cylinder, tlie,ei id of the and y i dernea yt r rod inthe first cylinder, a piston andpiston rodin the secondcylinder, said piston rod comprising a screw driver, means of applymgpressure to e ther side of said cylinder for raising and lowering thescrew driver, a

clutchv splined to said "screwdriver movable laterally thereby' 'a ndtherewith, a driving fniean s carried by frame adapted to be engaged bysaid clutch, whereby pressure i *fli first mentioned cylinder will causeiso ' 'saidf-rameand first cylinder,

' second cylinder engaged by the piston rod I in the first cylinder, apiston and piston rod I in'the second cylinder, said piston rodcom isaid clutch to engage to drive the screw driver.

"5. In combination a stationary frame,a sta tionary cylinder mountedthereon, means for applying pressure with respect to ond cylinderadapted to move the end of the prising a screw driver, meansof applyingpressure to either side of'said cylinder for 1 raising and lowering thescrew driver,"a

clutch splined to said screw drivermovable laterally'thereby andtherewith, a driving means carried by said frame adapted to] be a aengaged by said clutch, wherebypressure I clutch splined to said screwdriver movable; and therewith, a driving means carried by said frameadapted to be 1 laterally thereby inder, a piston and piston rodtherein, a second cylinder adapted to move with respect to said'fr'ameand first cylinder,the end of l the second cylinder engaged by thepiston rod in the first cylinder,-a.pist'on and piston'rod in the secondcylinder, said pistonirod com 4 prising a screw driver, means ofapplyingpress'ure'to either side of said cylinder for" raising andlowering the screw driver, a

in the first mentioned cylinder will cause said clutch to engage todrive the screw drivv -er, yielding means to resist the movementof andbetween said drivingmeans and the sta- I a V tionary frame on. theother, and yielding means to resist the yertical movement of the saidclutch and thrust bearings betweenf'said yielding means onone side andthe] clutch screwdriver,xa guide sleeve carried by said vframe forguiding'said screw driver and j a supporting said yieldingmeans.

. In testimonywhereof, I affix my signature. WILLIAM E. MOLAUGHLIN.

to one end of saidcylin-l H der, a plston and piston rod therein, a sec-

